Germs? Other solar systems? DNA? Cells? Just to give a brief example. All things we cannot see without a tool to help us see it, and because of which, did not know even existed.
I'm sure you could list some things, but here is something to consider. When we didn't know the existence of these things, or their makeup, we made superstitious guesses based on belief systems. We turned out to be wrong every time. So I would say that there may be things out there that we have not yet detected or measured. What are those thing? I don't know. OR I could take the course that humankind has for its history, and take a guess, believe in my guess with all my heart, and then most likely be proven wrong. It's the teapot argument. I can't prove that a teapost is not orbiting the earth right now. But I can hypothesize. The problem is when I mistake my hypothesis for a fact. I could so believe in this hypothesis that I will be confident that one day science will find the teapot. That doesn't make it true, no matter how much I believe it is there.
Why stop at teapot? T rex is floating around the earth. Heaven is made of jelly beans. We just can't measure it yet. That's the point we are trying to make. Until we have some evidence to follow, then we have nothing but guesswork. Some of us conclude that we are okay with an unanswered question, and we really don't need to fill the gap with gods, aliens, or undetected energy.
You can say whatever you want to say about what has never been detected. We all can, but it is not an argument.
